““Researches still don't have an explanation for the differnece between the sizes of dogs' and wolves' brains - or for why every species of domesticated animal, from ducks and geese to horses and pigs, also has a smaller brain than its wild ancestor. The reason or reasons domestication always leads to smaller brains are hotly debated; but the effects are universal. Anthropologists have documented the same change in Homo sapiens: the brains of modern humans have shrunk about 10 percent over the last ten thousand years.””
